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		                             National Stock Number: 6650-01-323-1354
  Federal Supply Class: 6650
  National Item Identification Number: 013231354
  Description: RING,RETAINING,OPTICAL ELEMENT
  Detail: A CYLINDRICAL ITEM HAVING AN INTERNALLY FLANGED DIAMETER DESIGNED TO RETAIN A LENS OR WINDOW IN THE OBJECTIVE END, OR A DIOPTER SCALE AT THE VIEWING END OF AN OPTICAL INSTRUMENT. IT MAY HAVE ONE OR MORE OF THE FOLLOWING CHARACTERISTICS: INTERNAL THREAD OR MACHINED FOR A PRESS FIT, METHOD OF SECURING, AND/OR KNURLED PERIPHERY. FOR EXTERNALLY THREADED ITEMS, SEE RETAINER, OPTICAL ELEMENT. EXCLUDES CELL, OPTICAL ELEMENT; NUT, PLAIN KNURLED; NUT, PLAIN ROUND; AND RING, RETAINING.
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  Manufacturer Information:
 | 42800093-001 | 22787 | PRECISION AEROSPACE CORPORATION DBA PRECISION ENGINE CONTROL |   
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